What is it that’s different about different people that means caffeine (or maybe all drugs that alter mental states?) can affect different people in different ways.
For me coffee has no noticeable affect on my energy at all seems to actually work quite well as a warm drink before sleeping. But for others it can give them more energy or even make them anxious?
In: 3
There’s a lot of different factors. One that I know of is people have different versions of liver enzymes that metabolize caffeine, so they will metabolize it at different rates. This means that the caffeine will remain in the bloodstream for different amounts of time in different people.
This is also true for other drugs, so one dose may be appropriate for one person, but the same dose might kill someone else.
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